SE8101614L - BLADE PITCH CONTROL SYSTEMS - Google Patents
BLADE PITCH CONTROL SYSTEMSInfo
- Publication number
- SE8101614L SE8101614L SE8101614A SE8101614A SE8101614L SE 8101614 L SE8101614 L SE 8101614L SE 8101614 A SE8101614 A SE 8101614A SE 8101614 A SE8101614 A SE 8101614A SE 8101614 L SE8101614 L SE 8101614L
- Authority
- SE
- Sweden
- Prior art keywords
- fluid
- actuators
- sources
- source
- blades
- Prior art date
Links
- 239000012530 fluid Substances 0.000 abstract 7
- 230000007257 malfunction Effects 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/024—Adjusting aerodynamic properties of the blades of individual blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0224—Adjusting blade pitch
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05B2260/74—Adjusting of angle of incidence or attack of rotating blades by turning around an axis perpendicular the rotor centre line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05B2260/76—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism using auxiliary power sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
- F05B2260/79—Bearing, support or actuation arrangements therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/10—Purpose of the control system
- F05B2270/107—Purpose of the control system to cope with emergencies
- F05B2270/1074—Purpose of the control system to cope with emergencies by using back-up controls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/50—Control logic embodiment by
- F05B2270/506—Control logic embodiment by hydraulic means, e.g. hydraulic valves within a hydraulic circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/60—Control system actuates through
- F05B2270/604—Control system actuates through hydraulic actuators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/130,658 US4348155A (en) | 1980-03-17 | 1980-03-17 | Wind turbine blade pitch control system |
Publications (2)
Publication Number | Publication Date |
---|---|
SE8101614L true SE8101614L (en) | 1981-09-18 |
SE446653B SE446653B (en) | 1986-09-29 |
Family
ID=22445725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8101614A SE446653B (en) | 1980-03-17 | 1981-03-13 | BOWL SLEEP CONTROL SYSTEM FOR MULTI-BOWLY WIND TURBINES |
Country Status (20)
Country | Link |
---|---|
US (1) | US4348155A (en) |
JP (1) | JPS57373A (en) |
KR (1) | KR850000936B1 (en) |
AR (1) | AR230322A1 (en) |
AU (1) | AU540223B2 (en) |
BR (1) | BR8101492A (en) |
CA (1) | CA1146078A (en) |
DE (1) | DE3110263A1 (en) |
DK (1) | DK105281A (en) |
ES (1) | ES500375A0 (en) |
FI (1) | FI73790C (en) |
FR (1) | FR2478218A1 (en) |
GB (1) | GB2071781B (en) |
IL (1) | IL62274A (en) |
IN (1) | IN153214B (en) |
IT (1) | IT1137431B (en) |
NL (1) | NL8101232A (en) |
NO (1) | NO157793C (en) |
SE (1) | SE446653B (en) |
ZA (1) | ZA811359B (en) |
Families Citing this family (64)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4352634A (en) * | 1980-03-17 | 1982-10-05 | United Technologies Corporation | Wind turbine blade pitch control system |
US4379678A (en) * | 1980-10-07 | 1983-04-12 | Textron, Inc. | Individual blade control |
US4462753A (en) * | 1982-06-22 | 1984-07-31 | United Technologies Corporation | Blade feathering system for wind turbines |
DE3227700A1 (en) * | 1982-07-24 | 1984-01-26 | BÖWE Maschinenfabrik GmbH, 8900 Augsburg | WIND ENERGY CONVERTER |
CA1234543A (en) * | 1982-11-08 | 1988-03-29 | Kermit I. Harner | Blade pitch angle control for large wind turbines |
JPS59134385A (en) * | 1983-01-24 | 1984-08-02 | Matsushita Seiko Co Ltd | Safety device for wind force prime mover |
US4534704A (en) * | 1983-02-08 | 1985-08-13 | The Boeing Company | Helicopter rotor control system with integrated hub |
US4815936A (en) * | 1988-07-05 | 1989-03-28 | United Technologies Corporation | Wind turbine shutdown system |
DE19541202C2 (en) * | 1995-11-04 | 1997-12-11 | Muehlbauer Luftfahrttechn Gmbh | Feathering propeller system for motor gliders and single-engine aircraft |
DE19731918B4 (en) * | 1997-07-25 | 2005-12-22 | Wobben, Aloys, Dipl.-Ing. | Wind turbine |
DE19948997B4 (en) * | 1999-10-11 | 2005-04-14 | Aerodyn Engineering Gmbh | Single blade adjustment for wind turbines |
ES2181572B1 (en) * | 2001-01-31 | 2003-12-01 | Fundacion Fatronik | ROTOR DEVICE FOR INDEPENDENT CONTROL OF THE PASSAGE VARIATION OF EACH PALA. |
DE10140793A1 (en) * | 2001-08-20 | 2003-03-06 | Gen Electric | Device for adjusting the rotor blade of a rotor of a wind turbine |
DE10162942A1 (en) * | 2001-12-20 | 2003-07-03 | Gen Electric | Method for operating a wind power plant and wind power plant |
WO2005021962A1 (en) * | 2003-09-03 | 2005-03-10 | General Electric Company | Redundant blade pitch control system for a wind turbine and method for controlling a wind turbine |
DE102004017323A1 (en) * | 2004-04-06 | 2005-11-03 | Repower Systems Ag | Pitch control for blade in wind powered generator has a servo drive to vary the pitch and with a separate locking system to hold the basic pitch up to a set wind speed |
US7121795B2 (en) * | 2004-06-30 | 2006-10-17 | General Electric Company | Method and apparatus for reducing rotor blade deflections, loads, and/or peak rotational speed |
DE102004054608B4 (en) * | 2004-09-21 | 2006-06-29 | Repower Systems Ag | Method for controlling a wind turbine and wind turbine with a rotor |
EP1647708A1 (en) * | 2004-10-14 | 2006-04-19 | General Electric Company | Pitch drive system for a wind turbine |
JP2008527226A (en) * | 2004-12-30 | 2008-07-24 | ヴェスタス,ウィンド,システムズ エー/エス | Wind turbine having multiplexed redundant control system and method for controlling wind turbine |
ES2627790T3 (en) * | 2005-05-17 | 2017-07-31 | Vestas Wind Systems A/S | Pitch controlled wind turbine blade that has turbulence generation means, wind turbine and use of it |
ES2279725B1 (en) * | 2006-02-09 | 2008-07-16 | Hydra-Power, S.L. | DEVICE FOR THE CONTROL OF THE SHOVELS OF AN AEROGENERATOR. |
MX2008011751A (en) * | 2006-03-16 | 2008-11-12 | Vestas Wind Sys As | A method and control system for reducing the fatigue loads in the components of a wind turbine subjected to asymmetrical loading of the rotor plane. |
US7602075B2 (en) * | 2006-07-06 | 2009-10-13 | Acciona Windpower, S.A. | Systems, methods and apparatuses for a wind turbine controller |
DE102006032388B4 (en) * | 2006-07-13 | 2012-01-26 | Nordex Energy Gmbh | Wind turbine with a hydraulic system |
DE102007011990B4 (en) * | 2007-03-09 | 2019-01-10 | Tlt-Turbo Gmbh | Device for the hydraulic adjustment of the blades of an impeller of an axial fan |
CN101720387B (en) * | 2007-03-30 | 2014-01-08 | 维斯塔斯风力系统有限公司 | Wind turbine with pitch control arranged to reduce life shortening loads on components thereof |
US9039372B2 (en) * | 2007-04-30 | 2015-05-26 | Vestas Wind Systems A/S | Wind turbine blade |
ES2554797T3 (en) * | 2007-06-28 | 2015-12-23 | Siemens Aktiengesellschaft | Method for controlling at least one element of a first component of a wind turbine, control device and use of the control device |
US8246302B2 (en) * | 2007-09-06 | 2012-08-21 | Hamilton Sundstrand Corporation | Teeter-restraint device for wind turbines |
KR20100126265A (en) | 2007-11-01 | 2010-12-01 | 윈두런스 엘엘씨 | System and method for controlling a turbine blade |
US8038094B2 (en) * | 2008-03-31 | 2011-10-18 | Honda Motor Co., Ltd. | Hydraulic system for aircraft |
AU2008320935B2 (en) * | 2008-06-10 | 2012-02-16 | Mitsubishi Heavy Industries, Ltd. | Blade pitch-angle control apparatus and wind turbine generator |
NO328590B1 (en) * | 2008-07-03 | 2010-03-29 | Hydra Tidal Energy Technology | Turbine blade pitch control device |
US8096761B2 (en) * | 2008-10-16 | 2012-01-17 | General Electric Company | Blade pitch management method and system |
JP5330945B2 (en) * | 2008-10-29 | 2013-10-30 | 三菱重工業株式会社 | Hydraulic system and wind power generator equipped with the same |
GB0821239D0 (en) | 2008-11-21 | 2008-12-31 | Rolls Royce Plc | A machine such as a gas turbine |
JP5438979B2 (en) * | 2009-01-22 | 2014-03-12 | 三菱重工業株式会社 | Cylinder drive |
DE102009008607A1 (en) | 2009-02-12 | 2010-08-19 | Nordex Energy Gmbh | Device for locking a rotor blade of a wind energy plant |
KR101204551B1 (en) * | 2009-04-10 | 2012-11-23 | 미츠비시 쥬고교 가부시키가이샤 | Pitch drive device of wind-driven generator and wind-driven generator |
ES2380449T3 (en) * | 2009-07-10 | 2012-05-11 | Vestas Wind Systems A/S | Hydraulic station and procedure to control the pressure in a hydraulic system of a wind turbine |
CN101624969B (en) * | 2009-08-04 | 2011-08-10 | 清华大学 | Redundancy control system and redundancy control method for wind power generation propeller change |
US8770934B2 (en) * | 2009-12-16 | 2014-07-08 | Hamilton Sundstrand Corporation | Teeter mechanism for a multiple-bladed wind turbine |
EP2339174A1 (en) * | 2009-12-22 | 2011-06-29 | Siemens Aktiengesellschaft | System for triggering an emergency system of wind turbine |
GB201007565D0 (en) | 2010-05-06 | 2010-06-23 | Rolls Royce Plc | Pitch control mechanism |
GB201007569D0 (en) | 2010-05-06 | 2010-06-23 | Rolls Royce Plc | Pitch control mechanism |
GB201007567D0 (en) | 2010-05-06 | 2010-06-23 | Rolls Royce Plc | BAck-up featherer |
GB201007564D0 (en) | 2010-05-06 | 2010-06-23 | Rolls Royce Plc | Back-up featherer |
EP2444316B1 (en) * | 2010-10-25 | 2016-02-17 | MT-Propeller Entwicklung GmbH | Hydraulic variable pitch propeller |
EP2638281B1 (en) | 2010-11-10 | 2021-01-13 | General Electric Company | Method and system for operating wind turbine during fault |
EP2458203B1 (en) * | 2010-11-26 | 2015-04-22 | Vestas Wind Systems A/S | A wind turbine having a hydraulic blade pitch system |
US9121385B2 (en) | 2010-11-26 | 2015-09-01 | Vestas Wind Systems A/S | Wind turbine and a method for pitching a blade of a wind turbine |
US9068556B2 (en) | 2010-11-26 | 2015-06-30 | Vestas Wind Systems A/S | Pilot circuitry for controlling the emergency feathering of a wind turbine |
CN102536660B (en) | 2010-11-26 | 2014-10-29 | 维斯塔斯风力系统有限公司 | Wind turbine with hydraulic blade pitch system |
US8922039B2 (en) | 2011-01-24 | 2014-12-30 | Vestas Wind Systems A/S | Wind turbine and a method for powering one or more hydraulic pitch actuators |
EP2546517B1 (en) * | 2011-07-13 | 2016-03-30 | ALSTOM Renewable Technologies | Wind turbine rotor |
FR3014153B1 (en) * | 2013-12-02 | 2015-12-18 | Snecma | DEVICE FOR THE HYDRAULIC CONTROL OF JACKS |
DE202015001902U1 (en) | 2015-03-11 | 2016-06-14 | Liebherr-Components Biberach Gmbh | Adjustment unit for pitch adjustment of a rotor blade and wind turbine with such an adjustment |
US10655602B2 (en) | 2015-10-14 | 2020-05-19 | Vestas Wind Systems A/S | Pitch control system for pitching wind turbine blade |
CN108368829B (en) * | 2015-10-14 | 2021-03-16 | 维斯塔斯风力系统集团公司 | Method for controlling hydraulic pitch power system |
DE102016013796A1 (en) * | 2016-11-21 | 2018-05-24 | Senvion Gmbh | Wind turbine with braking device and method for operating the same |
IT201900010929A1 (en) | 2019-07-04 | 2021-01-04 | Ge Avio Srl | PROPELLER GROUP AND PITCH CONTROL UNIT |
CN110748455B (en) * | 2019-11-29 | 2024-01-19 | 中国华能集团清洁能源技术研究院有限公司 | Redundant feathering system and method for controlling wind power variable pitch |
FR3120651B1 (en) | 2021-03-09 | 2023-05-12 | Safran Aircraft Engines | BLADE PITCH SETTING DEVICE FOR TURBOMACHINE AND TURBOMACHINE COMPRISING IT |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB562845A (en) * | 1941-12-26 | 1944-07-19 | Automotive Prod Co Ltd | Improvements in or relating to variable pitch propellers for water craft |
GB605561A (en) * | 1945-03-24 | 1948-07-27 | John Sidney Neale | Improved pitch controlling means for rotor blades of helicopters |
US2597419A (en) * | 1949-06-02 | 1952-05-20 | Hobson Ltd H M | Hydraulic servomotor and the like |
US3256780A (en) * | 1963-12-10 | 1966-06-21 | United Aircraft Corp | Dual input servo control mechanism |
GB1185041A (en) * | 1966-04-12 | 1970-03-18 | Dowty Rotol Ltd | Adjustable Bladed Rotors |
US4007845A (en) * | 1975-03-17 | 1977-02-15 | Massey-Ferguson Inc. | Swing mechanism |
US4083651A (en) * | 1976-08-17 | 1978-04-11 | United Technologies Corporation | Wind turbine with automatic pitch and yaw control |
DE2655026C2 (en) * | 1976-12-04 | 1979-01-18 | Ulrich Prof. Dr.-Ing. 7312 Kirchheim Huetter | Wind energy converter |
US4161658A (en) * | 1978-06-15 | 1979-07-17 | United Technologies Corporation | Wind turbine generator having integrator tracking |
US4274808A (en) * | 1978-12-21 | 1981-06-23 | Textron, Inc. | Swashplate drive redundancy system |
-
1980
- 1980-03-17 US US06/130,658 patent/US4348155A/en not_active Expired - Lifetime
-
1981
- 1981-02-26 CA CA000371858A patent/CA1146078A/en not_active Expired
- 1981-03-02 ZA ZA00811359A patent/ZA811359B/en unknown
- 1981-03-02 IN IN226/CAL/81A patent/IN153214B/en unknown
- 1981-03-03 GB GB8106578A patent/GB2071781B/en not_active Expired
- 1981-03-03 IL IL62274A patent/IL62274A/en unknown
- 1981-03-09 DK DK105281A patent/DK105281A/en unknown
- 1981-03-12 NO NO810843A patent/NO157793C/en unknown
- 1981-03-13 BR BR8101492A patent/BR8101492A/en not_active IP Right Cessation
- 1981-03-13 NL NL8101232A patent/NL8101232A/en not_active Application Discontinuation
- 1981-03-13 SE SE8101614A patent/SE446653B/en not_active IP Right Cessation
- 1981-03-16 AR AR284617A patent/AR230322A1/en active
- 1981-03-16 FR FR8105173A patent/FR2478218A1/en active Granted
- 1981-03-16 AU AU68412/81A patent/AU540223B2/en not_active Ceased
- 1981-03-16 ES ES500375A patent/ES500375A0/en active Granted
- 1981-03-16 FI FI810813A patent/FI73790C/en not_active IP Right Cessation
- 1981-03-17 DE DE19813110263 patent/DE3110263A1/en active Granted
- 1981-03-17 IT IT20376/81A patent/IT1137431B/en active
- 1981-03-17 KR KR1019810000864A patent/KR850000936B1/en active
- 1981-03-17 JP JP3929581A patent/JPS57373A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
BR8101492A (en) | 1981-09-15 |
FR2478218B1 (en) | 1984-12-21 |
GB2071781B (en) | 1983-06-22 |
NO810843L (en) | 1981-09-18 |
US4348155A (en) | 1982-09-07 |
AU6841281A (en) | 1981-09-24 |
FR2478218A1 (en) | 1981-09-18 |
ZA811359B (en) | 1982-03-31 |
FI810813L (en) | 1981-09-18 |
ES8204073A1 (en) | 1982-05-01 |
IN153214B (en) | 1984-06-16 |
NO157793C (en) | 1988-05-25 |
ES500375A0 (en) | 1982-05-01 |
DK105281A (en) | 1981-09-18 |
GB2071781A (en) | 1981-09-23 |
IL62274A0 (en) | 1981-05-20 |
NL8101232A (en) | 1981-10-16 |
NO157793B (en) | 1988-02-08 |
CA1146078A (en) | 1983-05-10 |
IL62274A (en) | 1983-09-30 |
IT8120376A0 (en) | 1981-03-17 |
FI73790C (en) | 1987-11-09 |
DE3110263A1 (en) | 1982-03-25 |
DE3110263C2 (en) | 1987-01-22 |
KR850000936B1 (en) | 1985-06-28 |
JPS57373A (en) | 1982-01-05 |
SE446653B (en) | 1986-09-29 |
FI73790B (en) | 1987-07-31 |
JPH0147627B2 (en) | 1989-10-16 |
IT1137431B (en) | 1986-09-10 |
AR230322A1 (en) | 1984-03-01 |
KR830005485A (en) | 1983-08-20 |
AU540223B2 (en) | 1984-11-08 |
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NUG | Patent has lapsed |
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